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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3c40e4bbec7767e6e83ee8596bbe44096ff24ba839cb37d2f6eae821e1bd132' 
  AND token = '7lcLuJzHcVvTXm6boEfghgM49alEmP4EW/crH9vNyPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}